Slide projector using a box or circular slide magazine



July 1, 1969 w, H Re. 26,619

SLIDE PROJECTOR USING A BOX OR CIRCULAR SLIDE MAGAZINE Original FiledMarch 1, 1965 Sheet of s INVENTOR.

Walier J H6111,

BY W WW July 1, 1969 w, J HALL Re. 26,619

SLIDE PROJECTOR USING A BOX OR CIRCULAR SLIDE MAGAZINE Original FiledMarch 1, 1963 Sheet 2 of 5 INVENTOR.

Wa/fc r J H0 [1,

July 1, 1969 W. J HALL SLIDE PROJECTOR USING A BOX OR CIRCULAR SLIDEMAGAZINE Original Filed March 1, 1963 Sheet 3 of 5 u I r 1 V If I 5 fl.1 J 7 mnnnnnn n pnmnnmnnnn nnnnnnnnnm x wnpnnnnflt:

v I 11/1 1/1 I I INVENTOR.

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BY MM Wm W. J. HALL July 1, 1969 SLIDE PRQJEGTOR USING A BOX OR CIRCULARSLIDE MAGAZINE Sheet Original Filed March 1, 1963 INVENTOR. Maia; Jflail,

BY M July 1, 1969 w, J, HALL Re. 26,619

SLIDE PROJECTOR USING A BOX OR CIRCULAR SLIDE MAGAZINE Original FiledMarch 1, 1963 Sheet 5 of 5 MdMm m w United States Patent Ofiice Re.26,619 Reissued July 1, 1969 26,619 SLIDE PROJECTOR USING A BOX ORCIRCULAR SLIDE MAGAZINE Walter J. Hall, Chicago, Ill., assignor, bymesne assignments, to GAF Corporation, a corporation of DelawareOriginal No. 3,209,647, dated Oct. 5, 1965, Ser. No.

262,098, Mar. 1, 1963. Application for reissue Oct. 3,

1967, Ser. No. 675,262

Int. Cl. G03b 23/00 US. Cl. 353-117 28 Claims Matter enclosed in heavybrackets appears in the original patent but forms no part of thisreissue specification; matter printed in italics indicates the additionsmade by reissue.

ABSTRACT OF THE DISCLOSURE A projector having a longitudinally extendinggroove for alternate reception of a box tray and a circular tray. Thebox tray is supported in the groove by resting on the base of thelatter. The circular tray is supported in vertical dispostion byengaging the groove adjacent one side wall of the latter and by engaginga pair of lugs on the other side wall the groove. These lugs are equallyspaced forwardly and rearwardly of the axis of rotation of the tray.

This invention relates, generally, to innovations and improvements inphotographic slide projectors, and more particularly to a slideprojector adapted to have either a conventional, elongated box-like,slide magazine or tray or a circular slide tray operatively associatedtherewith.

As it is known to those skilled in the art, photographic slide trays ormagazines are provided in two basic forms: viz., a box-like slide trayadapted to be received in a slide projector for linear slide indexingmovement, or a circular slide tray adapted to be received in a slideprojector for rotary slide indexing movement. Circular slide trays maybe of the type adapted to rotate in either a vertical or horizontalplane. Heretofore, slide projectors have been incapable of accepting andoperating with linear and/or rotary slide trays with equal facility.

It is a primary object of this invention to provide a new and improvedslide projector adapted to have either an elongated box-like slide trayor a circular slide tray operatively associated therewith.

It is another object of the present invention to provide in a slideprojector of the type characterized by a housing having, on the exteriorthereof, a longitudinally extending slide-tray-receiving groove orchannel[, means for alternately supporting] for reception of anelongated boxlike slide tray, unique means for supporting [and] avertically disposed circular slide tray in said groove.

Still another object of the present invention is the provision of newand improved means in a slide projector for supporting a circular slidetray in vertical disposition by engaging the latter at its outerperiphery.

A further object of the present invention is to provide in a slideprojector of the type characterized by a housing having, on the exteriorthereof, a longitudinally extending slide-tray-receiving groove, meansfor operatively supporting a circular slide tray in said groove in avertically extending position, which means include protruding meanspermanently afiixed to the projector and shaped and spaced fornon-interfering relationship with a boxlike slide tray when the latteris operatively supported in the groove.

An even further object of the present invention is to provide a new andimproved vertically extending circular slide tray adapted for operativerotation while supported at the periphery thereof and adapted to bestabilized by engagement of an annular hub track thereof with guidetrack means on a projector.

[It is a still further object of the present invention to provide acircular slide tray having new and improved slide retaining means] Theseand other objects and advantages of the invention will become apparentfrom the following specification wherein like numerals refer to similarparts throughout.

In the drawings:

FIG. 1 is an elevational view of a slide projector and circular slidetray illustrating this invention, with a portion of the slide tray beingbroken away for better illustration of the invention;

FIG. 2 is a rear elevational view of the slide projector and circularslide tray of FIG. 1;

FIG. 3 is a top plan view of the slide projector and circular slide trayof FIG. 1;

FIG. 4 is an enlarged fragmentary section taken along the line 44 ofFIG. 1',

FIG. 5 is a fragmentary section taken along the line 55 of FIG. 3 withcertain parts of the projector not being shown for better illustrationof the invention;

FIG. 6 is an enlarged fragmentary section taken along the line 66 ofFIG. 5;

FIG. 7 is an enlarged fragmentary section taken along the line 77 ofFIG. 1 showing the circular slide tray engaging protruding means mountedin the slide-trayreceiving groove of the projector, with certain partsof the projector not being shown;

FIG. 8a is a fragmentary plan view of one of the spring clip retainermembers of the circular slide tray [of this invention], the retainerbeing shown before the same is bent in arcuate form along the lengththereof;

FIG. 8b is a view similar to FIG. 8a showing the other side of one ofthe spring clip retainer members;

FIG. 9 is a side elevational view of the slide projector of FIG. 1having a box-like slide tray operably associated therewith; and

FIG. 10 is a section taken along the line 1010 of FIG. 9.

FIGS. 1 through 3 show a photographic slide projector, generallydesignated 10, which projector includes a housing or casing 11 having alongitudinally extending slidetray-receiving groove, generallydesignated 12, formed in the exterior thereof. A control panel portion13 having a number of suitable control buttons 14 and control knobslSoperably mounted thereon extends along one side of the projector. Theprojector also includes a carrying handle 18, a snap-on cover (notshown), an on-off-lamp switch 19 (FIG. 2) and louvers 20 through whichair may be drawn for cooling the optical system of the slide projector.The casing has an electric socket 22 recessed therein adapted to receivea conventional male plug on the end of an electric cord for applyingelectric power to the slide projector. The operating components of theslide projector will not be described as they form no part of thepresent invention. However, it will be understood that the slideprojector 10 contains suitable components including a blower, lamp,reflector, and lenses for projecting photographic slides (e.g. 35 mm.slides) through an objective lens supported in an adjustable housing 23(FIG. 3), which housing is suitably mounted for axial movement withinthe casing. By way of reference the inner mechanism of the projector maycorrespond to that shown and disclosed in Brown application, Serial No.824,877, filed July 3, 1959, now US. Patent No. 3,120,150, grantedFebruary 4, 1964.

As best seen in FIGS. 2 and 4, the slide-tray-receiving groove 12includes a base or floor 25 and side walls 26 and 27, the latter wallcontaining an aperture 28 (FIG. 5) at the mid-point thereof. Side wall26 includes a vertically extending slide-receiving slot 29 at themid-point thereof, which slot exposes slide receiving means in the formof parallel, horizontally extending upper and lower guide tracks 30a and30b, respectively. The guide tracks extend at right angles to the groove12, and the tip of upper guide track 30a extends a short distancethrough slot 29 into the groove 12. Floor 25 is provided with aplurality of parallel, spaced apart, longitudinally extending ribs 31for supporting a slide tray in groove 12; the function of ribs 31 willbe more fully explained below.

The control panel portion 13 of the slide projector includes atransversely extending recess 32 (FIG. 1) in which is slidably mounted asuitable slide carrier 33 having a handle 34 extending upwardlytherefrom. The slide carrier includes a pusher bar 35 (FIG. 4) adaptedto extend through aperture 28 in wall 27. It will be understood that theslide carrier is adapted for reciprocal movement in recess 32 forpushing photographic slides by the bar 35 from a slide tray adapted tobe received in groove 12 into slot 29 and for returning slides from theslot to the slide tray. Flipper or kicker means (not shown) are providedwith the slide carrier for returning a slide to the slide tray.

As seen in FIG. 4, the slide-tray-receiving groove 12 includes anopening 36 in opposed alignment with the slot 29, which opening isformed at the intersection between base 25 and side wall 27. A traydriving pinion 37 operatively associated with the slide carriage 33 andadapted for rotation about a vertical axis has a toothed portion thereofextending through opening 36 and into the groove 12. As will be morefully explained below in connection with the description of the slidetrays adapted to be associated with the projector 10, the pinion 37 isadapted to index or rotate in response to movement of slide carriage 33for indexing of a slide tray received in groove 12.

The circular slide tray [of this invention,] generally designated 40,which is disclosed and claimed in application Ser. No. 461,574, filedMay 3, 1965, as at division of original application Ser. No. 262,098,now Patent No. 3,353,667 will be seen from FIGS. 1 through 3 to be ofthe vertically disposed type including inner and outer concentric walls41 and 42, respectively, having a plurality of radially disposedcircumferentially spaced partitions or septums 43 extendingtherebetween. The partitions 43 are closely spaced apart defining aplurality of radially arranged slide receiving spaces or compartments inthe circular slide tray. It will be understood that a conventionalphotographic slide (e.g. 35 mm. transparency mounted in a cardboardslide mount), fragmentarily shown by phantom lines and indicated 45 inFIG. 4, is adapted to be received in each of the slide receiving spaces44 for movement axially of the circular slide tray into the slot 29 ofthe projector when the slide tray is operatively supported within thegroove 12. The circular slide tray 40 is further characterized by anannular band portion 47 and a plurality of circumferentially spacedapart axially extending ribs 48 formed on the outer surface of the outerwall 42. The circular slide tray, which is preferably molded from asuitable plastic material, includes an outer vertical face characterizedby an outwardly extending annular hub flange 49 integral with the innerwall 41, an annular ring 50 secured to each of the partitions 43 and anannular rack formation of teeth 51. The circular slide tray includes aninner face characterized by an inwardly extending annular hub flange 52integral with the inner wall 41.

The circular slide tray 40 is adapted to be operatively received invertically extending disposition in the longitudinally extendingslide-tray-receiving groove 12 with one of the slide-receiving spaces 44in alignment with the slide-receiving slot 29. In other words, thecircular slide tray [of this invention] is mounted for rotation aboutits principal axis, i.e., its central longitudinal axis, which axis isparallel to a transverse axis extending through slot 29. As best seen inFIG. 4, when the slide tray 40 is received in groove 12 one of the ribs48 of the slide tray engages the innermost rib 31 on the base 25 of thegroove for establishing a support point between the slide tray andgroove. With the circular slide tray 40 in this disposition in groove12, certain teeth 51 on the slide tray are in meshing engagement withcertain teeth of gear 37. Rotation or indexing of gear 37 in response tomovement of slide carrier 33 indexes the circular slide tray forpositioning one of the adjacent slide receiving spaces 44 in alignmentwith slot 29, depending upon the direction the pinion gear 37 is driven.However, the circular slide tray 40 is not supported by engagement ofteeth 51 and the teeth on gear 37. In addition to the support for thecircular slide tray established by transverse engagement of one of theribs 48 with the innermost rib 31, further means are provided forslidably engaging the periphery of the slide tray adjacent the outerface thereof for operatively supporting the slide tray in the groove 12and preventing the same from rolling from the groove.

As seen in FIGS. 5, 6 and 7, this means is in the form of a pair of lugsor protruding inserts 55, which lugs are bolted or riveted to the sidewall 27 of the slidetray-receiving groove 12 one on each side of theaperture 28. Each lug 55 includes a central rounded hub portion 56having a flattened top 57. As seen in FIGS. 5 and 7, the lugs 55 aremounted On the side wall 27 for engaging the periphery of the circularslide tray at points on the rounded hub portions 56 just inwardly of thefiat portions 57. The protruding inserts or lugs are located on sidewall 27 for slidably engaging the periphery of the circular slide traywhen the same is operatively positioned in groove 12 with one of thetray spaces 44 in alignment with slot 29. The circular slide trayincludes an outer annular rim portion 42a (FIG. 7) adapted for slidableengagement with the hub portions 56 of the lugs.

From the foregoing it is believed to be apparent that the circular slidetray 40 is supported in groove 12 in vertically extending disposition bybeing contacted at three points on the periphery thereof. One point ofcontact is established at the periphery of the tray adjacent the innerface thereof by engagement of one of the ribs 48 with the innermost rib31 of the base 25. The other two points of contact at the periphery ofthe tray are adjacent the outer face thereof and are established bycontact of the annular band portion 42a with the protruding inserts 55.The inserts or lugs 55 are spaced one forwardly and one rearwardly ofthe principal axis of tray 40 for engaging the periphery of the tray atspaced apart points forwardly and rearwardly of this axis. The lugsposition and support the tray for selective alignment of spaces 44therein with the slot 29 by engagement of the teeth on gear 37 with theteeth 51 on the tray, and the lugs also prevent the circular slide trayfrom rolling from groove 12. It will be apparent that tray 40 isremovably supported in groove 12 and adapted for operable rotationtherein by sliding engagement of the peripheral portions of the traywith the protruding inserts 55 and one of the ribs 31. In the preferredform of the invention the slide tray ribs 48 are shown as adapted toengage only one rib 31, Le, the innermost rib, on the base or floorportion of the groove 12. This single point contact between theperiphery of the tray and the groove 12 is not critical. Thecrosssection of the tray 40 or groove 12 or both may be appropriatelyvaried for allowing ribs 48 to engage other of the ribs 31 in thegroove. In this case the other ribs will serve to support the tray sothat the teeth 51 thereon will be in mating alignment with the teeth ongear 37, and in this case the lugs 55 function only for aligning thespaces 44 with slot 29 and for preventing the circular slide tray fromrolling in the groove 12.

As noted in FIG. 4, the upper guide track 30a projecting through slot 29in the projector casing is in alignment with an annular planar surfacedefined by the outside surface of the annular inner hub flange 52 (FIG.4). During rotation of circular slide tray 40 by gear 37 an nular flange52 intermittently abuts or slides against the end of upper guide track30a. If the projector is tilted slightly to the side away from thecontrol panel portion 13, the flange 52 will rest continuously againstthe protruding end of the track 30a. This action serves to stabilizesupport of slide tray 40 in groove 12.

FIGS. 9 and 10 show the slide projector 10 having a box-like slide tray,generally designated 60, operatively supported in theslide-tray-receiving groove 12. The slide tray 60, which may be of thetype disclosed in the Brown application, Ser. No. 824,877, filed July 3,1959, now United States Patent 3,120,150, includes a base portion havinga floor or bottom 61 adapted for sliding engagement with the ribs 31provided on the base 25 of the groove 12. The slide tray 60 furtherincludes a cover 62 adapted to be removably or hingedly attached to thebase portion of the slide tray. The base portion of the slide trayincludes end walls (not shown) and a plurality of parallel partitions 63evenly spaced apart between the end walls. The partitions 63 define aplurality of slide receiving spaces for receiving conventionalphotographic slides, one of which slides is shown in phantom lines andindicated 64 in FIG. 10. The cover 62 includes a plurality of dependingribs 65 adapted for respective alignment with partitions 63 for furtherdefining the slide receiving spaces in the slide tray 60. The cover 62also includes a plurality of spring clips 66 attached to the undersidethereof, which spring clips are adapted to engage the upper edges of theslides for securely holding the same in place in the slide tray. Theouter face of slide tray 60, Le, the face adjacent groove side wall 27,includes a longitudinally extending opening defined by upper and lowerbase portions 68, 69 respectively. This open space on the outer face ofslide tray 60 allows pusher bar 35 associated with slide carrier 33 toengagethe outside edge of one of the slides supported in the slide trayfor pushing the slide into slot 29 of the slide projector housing. Lowerbase portion 69 is provided with a rack of teeth 71 extending along thelength thereof, which teeth are adapted to mesh with the teeth ondriving pinion 37 for indexing of slide tray 60 by pinion 37. As it willbe noted from FIG. 10, the protruding inserts or lugs 55 are located onside wall 27 for non-interfering relation with slide tray 60. Moreparticularly, the flattened portions 57 of the lugs 55 clear the bottomof base portion 68 when slide tray 60 is operatively positioned ingroove 12. By this construction it 'will be apparent that lugs 55, whichare located in groove 12 for support of the circular slide tray 40, inno way interfere with the operation of slide tray 60 when the latter isoperatively associated with the slide projector. A number of othercommercially available, linear or straight slide trays may be used inthe groove 12.

It is desirable to provide the circular slide tray 40 with means forpreventing photographic slides from falling from the slide receivingspaces therein if the tray is inadvertently tipped during handling ofthe same. The circular slide tray 40 includes such means in the form ofa plurality of detachable spring clip retainers, generally designated75, which retainers are illustrated in FIGS. 7 and 8. The retainer 75 isgenerally U-shaped in crosssection and includes a first leg 76 having atleast one lug 77 extending at a right angle from one edge thereof (FIGS.8a and 8b). The other leg of retainer 75 is in the form of a pluralityof parallel, spaced-apart spring fingers 78.

As seen in FIG. 7, outer wall 42 of the circular slide tray includesadjacent the outer face thereof an annular portion 80 of greater insidediameter than the inside diameter of the major portion of the outerwall. This portion of the outer wall 42 is separated from the majorportion of this wall by an annular shoulder 81, which shoulder isundercut defining an annular lip 82. The annular portion 80 of outerwall 42 includes a plurality of circumferentially spaced-apart, axiallyextending grooves 84 in the inner surface thereof. The grooves 84 openat one end thereof into teeth 51 on the outer face of the circular slidetray (FIGS. 1 and 7). The spring clip retainer 75 is adapted to bedetachably received in the circular slide tray by bending the retainerin arcuate form along the length thereof and by inserting the samebetween annular ring and annular portion 80. The retainer 75 is pushedinto the slide tray (to the left as seen in FIG. 7) until the bightportion of the retainer engages shoulder 81. Axially extending groove 84is adapted to receive lug 77 as the spring retainer is forced inwardlyin the circular slide tray. Engagement of lug 77 in groove 84 aids indetachably securing the retainer in place in the circular slide tray andprevents movement of the retainer along the length thereof relative tothe circular slide tray. A single retainer 75 of sufficient length maybe provided for extending completely around annular portion 80. In thepreferred form of the invention a number of retainers 75 are provided,which retainers are adapted to be bent in arcuate form and mounted inend-to-end relationship in annular portion 80. It will be understoodthat the retainer or retainers 75 are circumferentially located in theslide tray by engagement of lugs 77 in grooves 84 so that a springfinger 78 is in alignment with each of the slide receiving spaces 44. Asnoted in FIG. 7, each spring 78 is adapted to engage the inner edge ofone of the photographic slides 45 for holding the latter in place in thecircular slide tray. The spring fingers prevent inadvertent separationof the slides from the circular slide tray but permit the slides to beeasily pushed from the slide receiving spaces or returned thereto by theslide carriage.

Thus it will be seen that this invention provides in a slide projectorof the type characterized by a housing having a longitudinally extendingslide-tray-receiving groove, means for alternately supporting anelongated box-like slide tray and a circular slide tray in the groove.The protruding inserts or lugs provided in the longitudinally extendinggroove in the projector for operably supporting the circular slide traytherein do not in any Way interfere with the operation of a box-likeslide tray when the later is operatively positioned in the groove. Itwill be realized that it is within the scope of this invention toprovide the protruding inserts in other forms or to provide theprotruding inserts as an integral part of the side walls defining thegroove. In the preferred form of the invention the inserts or lugs aswell as the end of guide track 30a are made of a hard and smoothmaterial, such as nylon, to minimize friction between these parts andthe periphery of the tray.

It will be realized that this invention provides novel slide projectingmeans wherein a circular slide tray, elongated box-like slide tray andmeans on the projector for operatively supporting these trays may bemanufactured with ease and at a low cost. Exact tolerances need not beadhered to in the construction of the trays or in the shape of theslide-tray-receiving groove in the projector as the circular slide tray40 will be operatively supported in groove 12 in vertically extendingdisposition as long as any three contact or support points areestablished between the periphery of the tray and the surface of groove12. As mentioned above, in the preferred embodiment of the invention thethree support points are defined by the two protruding inserts or lugs55 and the innermost rib 31 of base 25. However, in certain instances,e.g., if tray 40 is slightly wider than usual or if guide track 30aextends more than the usual distance into groove 12, circular slide tray40 may be operatively supported only by engagement of the peripherythereof with both lugs 55 and with the tip of upper guide track 30a. Insome instances circular slide tray 40 may be supported 7 by engaging thetip of upper guide track 30a, the pinion gear 37 and one or both of theinserts 55. The circular slide tray is of light weight and symmetricalconstruction and almost any three point contact between its peripheryand groove 12 will serve to support tray 40 operatively in groove 12.

While the invention has been shown in bttt one form it will be obviousto those skilled in the art that it is not to be so limited, but on thecontrary it is susceptible of various changes and modifications withoutdeparting from the spirit and scope of the appended claims.

I claim:

1. In a slide projector of the type characterized by a housing having anexterior longitudinally extending slidetray-receiving groove and atransversely extending slidereceiving slot communicating with thegroove, which groove is open at the top and ends thereof for receivingan elongated box-like slide tray, the construction for operativelysupporting a circular slide tray in said groove in vertically extendingdisposition, which circular slide tray has a plurality of radiallyarranged slide receiving spaces, said construction comprising saidcircular slide tray and said groove having respective cross-sectionalconfiguration for establishing at least one support point between theouter surface of said slide tray and said groove when the tray is insubstantially vertical disposition with one of the slide receivingspaces therein in alignment with said slot, and said constructionincluding protruding means on said housing extending inwardly of saidgroove, said protruding means being adapted to be slidably engaged bysaid circular slide tray at points spaced apart on the periphery of thelatter, thereby to support removably said circular slide tray at saidsupport point and by said protruding means for rotation about theprincipal axis of the tray.

2. In a slide projector of the type characterized y a housing having anexterior longitudinall extending slide-tray-receiving groove and atransversely extending slide-receiving slot communicating with thegroove, which groove is open at the top and ends thereof for receivingan elongated box-like slide tray, the construction for operativelysupporting a circular slide tray in said groove in vertically extendingdisposition, which circular slide tray has a plurality of radiallyarranged slide receiving spaces, said construction comprising saidcircular slide tray and said groove having respective crosssectionalconfigurations for establishing at least one support point between saidcircular slide tray and [the base of] said groove adjacent one side wallof the latter when the tray is in substantially vertical dispositionwith one of the slide receiving spaces therein in alignment with saidslot, and said construction including a pair of lugs extending inwardlyfrom the other side wall of said groove. one of the lugs being spacedforwardly of said slot and the other of said lugs being spacedrearwardly of said slot, said lugs being adapted to be slidably engagedby said circular slide tray at points spaced apart on the periphery ofthe latter thereby to support removably said circular slide tray at saidsupport point and by said lugs for rotation about the principal axis ofthe tray.

3. The structure according to claim 2 wherein said lugs are[permanently] secured to said other side wall of said groove and shapedand spaced for non-interfering relationship with said box-like slidetray when the latter is operatively supported in said groove.

4. In a slide projector of the type characterized by a housing having anexterior longitudinally extending slide-tray-receiving groove and atransversely extending slide-receiving slot communicating with one sidewall of the groove, which groove is open at the top and ends thereof forreceiving an elongated box-like slide tray, and which groove includes anopening in the other side wall thereof in alignment with said slot forexposing the teeth of a slide tray driving [pinion] member, incombination, a circular slide tray having a plurality of radiallyarranged slide receiving spaces and a plurality of teeth spaced aroundthe periphery of the tray adjacent one face thereof, said circular slidetray having a cross-sectional configuration cooperating with the surfaceof said groove for establishing at least one support point between thecircular slide tray and [the base of] said groove adjacent said one sidewall thereof when the tray is in substantially vertical disposition withone of the slide receiving spaces therein in alignment with said slotand with one of the teeth of the tray in meshing alignment with [one Ofthe teeth of] said [pinion] driving member, and a pair of lugs extendinginwardly from the other side wall of said groove, one of said lugs beingspaced forwardly of said slot and the other of said lugs being spacedrearwardly of said slot, said lugs being adapted to be slidably engagedby said circular slide tray at spacedapart points on the periphery ofthe latter, whereby said circular slide tray is removably supported bysaid groove at said support point and by said lugs for being rotatedabout the principal axis thereof by said pinion.

5. In a slide projector of the type characterized by a housing having anexterior longitudinally extending slide-tray-receiving groove and atransversely extending vertical slide-receiving slot opening at one sidewall of the groove with an upper guide track extending from the upperportion of the slot, which groove is open at the top and ends thereoffor receiving an elongated box-like slide tray, in combination, acircular slide tray having a plurality of radially arranged slidereceiving spaces and an annular planar surface on the inner face of thetray, said circular slide tray having a cross-sectional configurationcooperating with the surface of said groove for establishing at leastone support point between the circular slide tray and the base of saidgroove adjacent said one side wall thereof when the tray is insubstantially vertical disposition with one of. the slide receivingspaces therein in alignment with said slot, and protruding means in saidgroove for engaging said circular slide tray at spaced apart points onthe periphery thereof for permitting operative rotation of the circulartray while supporting the latter in the groove, said upper guide trackbeing adapted to be abutted by said annular planar surface duringrotation of the circular slide tray whereby said circular slide tray isremovably supported by said groove at said support point and by saidprotruding means and vertically stabilized by said upper guide track forrotation about the principal axis of the tray.

6. In a slide projector of the type characterized by a housing having anexterior longitudinally extending slide-tray-receiving groove and atransversely extending vertical slide-receiving slot opening at one sidewall of the groove with an upper guide track extending from the upperportion of the slot, which groove is open at the top and ends thereoffor receiving an elongated box-like slide tray, in combination, acircular slide tray having a plurality of radially arrangedslide-receiving spaces and an annular planar surface on the inner faceof the tray, said planar surface being adapted to be engaged by saidupper guide track when one of said slide-receiving spaces is inalignment with said slot, said groove having protruding means thereinfor engaging said circular slide tray at spaced-apart points on theperiphery thereof when one of said slide receiving spaces is inalignment with said slot, said points being spaced forwardly andrearwardly of said slot, whereby said circular slide tray is operativelysupported in said groove by engagement of the periphery of the tray withsaid protruding means and by engagement of said annttlar planar surfacewith said upper guide track.

7. In a slide projector of the type characterized by a housing having anexterior longitudinally extending slidetray-receiving groove and atransversely extending vertical slide-receiving slot opening at one sidewall of the groove with an upper guide track extending from the upperportion of the slot, which groove is open at the top and ends thereoffor receiving an elongated box-like slide tray, in combination, acircular slide tray having a plurality of radially arranged slidereceiving spaces and an annular planar surface on the inner face of thetray, said circular slide tray having a cross-sectional configurationcooperating with the surface of said groove for establishing at leastone support point between the circular slide tray and the base of saidgroove adjacent said one side wall thereof when the tray is insubstantially vertical disposition with one of the slide receivingspaces therein in alignment with said slot, and a pair of lugs extendinginwardly from the other side wall of said groove, one of the lugs beingspaced forwardly of said slot and the other of said lugs being spacedrearwardly of said slot, said lugs being adapted to be slidably engagedby said circular slide tray at spaced apart points on the periphery ofthe latter, and said upper guide track being adapted to be abutted bsaid annular planar surface, whereby said circular slide tray isremovably supported by said groove at said support point and by saidlugs and vertically stabilized by said upper guide track for rotationabout the principal axis of the tray.

8. The structure according to claim 7 wherein said lugs are[permanently] secured in said groove and shaped and spaced fornon-interfering relationship with said box-like slide tray when thelatter is operatively supported in said groove.

9. In a slide projector of the type characterized by a housing having anexterior, longitudinally extending, open top, slide tray receivinggroove and a transversely extending slide-receiving slot communicatingwith the groove, which groove is adapted to receive an elongatedbox-like slide tray, the construction for supporting a circular slidetray in said groove with the principal axis of the tray extendinggenerally perpendicular with said groove and above the same, which trayincludes a plurality of radially arranged slide receiving spaces openingaxially of the tray at a common face thereof, said constructionincluding first and second means mounted respectively adjacent each sideof said groove and adapted to engage the circular slide tray forpermitting operative rotation of the same about said axis whilesupporting the latter in the groove for one at a time registration ofsaid spaces with said slot, s id means including members which engagethe outer periphery of the tray.

10. The construction according to claim 9 wherein said second means[adjacent one side of said groove] includes a member arranged to engagethe circular tray [at a point on the periphery thereof] for supportingthe tray against downward vertical movement, and wherein said firstmeans [adjacent the other side of the groove] engages the tray forsupporting the same against horizontal movement and against downwardvertical movement.

11. The construction according to claim 9 wherein said second means[adjacent one side of the groove] includes a member arranged to engagethe circular slide tray at the lowermost point on the periphery of thetray adjacent the associated face of the same thereby to support thetray against downward vertical movement only, and wherein the firstmeans [adjacent the other side of the groove] includes two membersarranged to engage the periphery of the tray adjacent the other face ofthe tray thereby to establish two additional supporting points, saidadditional points being at a horizontal level beneath said axis with oneof said points being forward of said slot and the other of said pointsbeing rearward of said slot.

12. In a slide projector of the type characterized by a housingincluding a lens system defining the optical axis of the projector,first and second means associated with said housing for supporting acircular slide tray with the longitudinal central axis thereof disposedhorizontally and in perpendicular relation with said optical axis, saidfirst means being arranged to engage said tray adjacent one face thereofto support the tray against downward vertical movement, and said secondmeans being arranged to engage said tray peripherally adjacent theopposite face thereof for supporting the tray against both horizontalmovement and downward vertical movement, said first and second meanspermitting separation of the tray from the housing by manual upwardwithdrawal of the former.

13. The construction according to claim 12 wherein said first and secondmeans together constitute a three point supporting system.

14. The construction according to claim 12 wherein said first meansengages the tray at a lowermost point on the periphery thereof andwherein said second means includes two members arranged to engage thetray at spaced points on the periphery thereof.

15. In a slide projector of the type characterized by a housingenclosing a lens system defining the optical axis of the projector, theconstruction comprising said housing having an upwardly opening slidetray receiving groove including generally parallel vertical side walls,first and second means associated with said side walls, respectively,and substantially disposed within said groove for supporting a circularslide tray with the longitudinal central axis thereof disposedhorizontally and in perpendicular relation with said optical axis andwith the lowermost portion of the tray received in the groove, saidfirst means being adapted to engage said tray adjacent the associatedface thereof and said second means being adapted to engage said trayadjacent the other face thereof, said first and second means permittingmanual upward withdrawal of the tray from the housing.

16. The construction according to claim 15 wherein said first and secondmeans together constitute a three point supporting system for said tray.

17. The construction according to claim 15 wherein said first meansengages the tray at a lowermost point on the periphery thereof andwherein said second means includes two members engaging the periphery ofthe tray at two points disposed beneath the central axis of the tray andforwardly and rearwardly thereof.

18. In combination, a slide projector having a housing including a lenssystem defining the optical axis of the projector, said housing havingan open top slide tray receiving groove, which groove extends along oneside of said axis in general parallel relation with the same, saidhousing further including a slide receiving slot opening into saidgroove at one side thereof, a circular slide tray having a plurality ofradially arranged slide receiving spaces opening at a common face of thetray, means mounted in said groove and engaging said tray for rotatablysupporting the latter with one of said spaces in registry with said slotand with the central axis of rotation of the tray arranged horizontallyand in perpendicular relation with said optical axis.

19. The combination according to claim 18 wherein said means removablysupport the tray for manual upward withdrawal from the groove.

20. The combination according to claim 18 wherein said means constitutea three point supporting system for the tray.

21. In combination, a slide projector having a housing enclosing a lenssystem defining the optical axis of the projector, said housing havingan open top slide tray receiving groove, which groove extends along oneside of said axis in general parallel relation with the same, saidhousing further including a slide receiving slot opening into saidgroove at one side thereof, a circular slide tray having a plurality ofradially arranged slide receiving spaces opening at a common face of thetray, first and second means mounted adjacent respective sides of saidgroove and engaging said tray for rotatably supporting the latter withone of said spaces in registry with said slot and with the central axisof rotation of the tray arranged horizontally and in perpendicularrelation with said optical axis, said first and second means permittingseparation of the tray from the groove by manual upward withdrawal ofthe former, said second means including mt)?!- 1 1 i hers which engagethe tray periphery on opposite sides'o'f said slot.

22. The combination according to claim 21 wherein said first meansengages the tray at the periphery thereof adjacent one face of the trayfor supporting the same against downward vertical movement, and whereinsaid members engage [second means engages] the periphery of the trayadjacent the other face thereof for supporting the tray against downwardmovement and against horizontal movement. 1

23. The combination according to claim 21 wherein said first and secondmeans constitute a three point supporting system for the tray.

24. The construction according to claim I further defined by, saidcircular slide tray including individual slide retaining means for eachof said slide receiving spaces, said retaining means forming an integralpart of said cirf cular tray and moving with the latter during rotationthereof.

25. The construction according to claim 9 further defined by, saidcircular slide tray including individual slide retaining means for eachof said slide receiving spaces, said retaining means forming an integralpart of said circular tray and moving with the latter during rotationthereof.

26. The construction according to claim 15 further defined by, saidcircular slide tray including a plurality of radially arranged slidereceiving spaces opening axially of the tray adjacent one face thereof,said circular slide tray including individual slide retaining means foreach of said slide receiving spaces, said retaining means forming anintegral part of said circular tray and moving with the latter duringrotation thereof.

27. The combination according to claim 18 further defined by, saidcircular slide tray including individual slide retainingmeans for eachof said slide receiving spaces, said retaining means forming an integralpart of said circulartray and moving with the latter during rotationthereof.

28. The combination accordingto claim 21 further defined by, saidcircular slide tray including individual slide retaining meansfor eachof said slide receiving spaces, said retaining means forming an integralpart of said circular tray and moving with the latter during rotationthereof.

References Cited The following references, cited by the Examiner, are ofrecord in the patented file of this patent or the original patent.

NORTON ANSHER, Primary Examiner; R. M. SHEER, Assistant Examiner.

